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ura·ni·nite | \ yu̇-ˈrā-nə-ˌnīt 
\
\Definition of uraninite
: a black octahedral mineral that consists of an oxide of uranium which usually contains thorium, lead, and rare earth elements and is the chief ore of uranium
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uraninite
nounura·ni·nite | \ yu̇-ˈrā-nə-ˌnīt \
\Medical Definition of uraninite
: a mineral that is basically a black octahedral or cubic oxide of uranium containing lead, thorium, and rare earth elements and that is the chief ore of uranium
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The first known use of uraninite was in 1879
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